I have dosed a little extra Fe from a bottle of easy life brand , and It made a white cloud
What does that mean ?
Control this day of kh and ph in mid day
Ph= 6,4 or 6,5
Does the CO2 is enough?
Looking better and better!
Usually that means the Fe is precipitating because the PH/KH is too high for the particular type.
Fe gluconate is particularly prone to do this. EDTA Fe might possibly do it but I think is unlikely. Fe DTPA would be the best source to use because it hold up better in harder water.
Read the label and see if it say what kind of Fe
Also what was the PH when you dosed it?
It "sounds" like enough but the only way to know for sure is to compare the PH from tank water that's been sat out for 24 hours (put some in a bowl) compared to the PH of the tank when the co2 is running.
Check the PH when the lights come on, and also 3-4 hours later. That will show if you have good co2 all day or only the last part of the day.
Ideally you want a solid 1 point drop not long after the lights come on, a drop of 1.2-1.3 is usually better